Thanks for your help. But it doesn't work.
If the problem is caused by the module-null-sink. From the attachment, We can see that, the module-null-sink was loaded,but can not found any data for key:sink:auto_null in the database. And I have tried to remove the module-null-sink from the default.pa, then the SIGBUS will no longer appeared, other error will appeared.

ÔÚ 2016-02-27 18:41:45£¬bugzilla-daemon@freedesktop.org дµÀ£º

Comment # 1 on bug 94316 from 
What do you mean when you say you ported pulseaudio to arm? Pulseaudio should
work on arm out-of-the-box.

After reading up on what SIGBUS might indicate, one possible cause for this
crash might be unaligned memory access. This will make alignment issues to
become invisible (with performance cost):

    echo 2 > /proc/cpu/alignment

Does that command appear to "fix" this crash? I hope it does, but in any case,
switch the alignment configuration back to 5 (or whatever was the original
value) and get a backtrace with gdb of the crash. A backtrace is needed for
further debugging.

You can read more about the kernel's alignment error handling configuration
here: https://www.kernel.org/doc/Documentation/arm/mem_alignment
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